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Related Concept Videos

Fluid Pressure01:14

Fluid Pressure

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In mechanical engineering, fluid pressure plays a critical role in designing systems that utilize liquid flow, such as hydraulic systems, pumps, and valves. When designing these systems, engineers must ensure they can withstand the forces created by fluid pressure to avoid damage or failure.
According to Pascal's law, a fluid at rest will generate equal pressure in all directions. This pressure is measured as a force per unit area, and its magnitude depends on the fluid's specific...
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Pascal's Law01:04

Pascal's Law

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In 1653, the French philosopher and scientist Blaise Pascal published "Treatise on the Equilibrium of Liquids," which discussed the principles of static fluids. A static fluid is a fluid that is not in motion. When a fluid is not flowing, we say that the fluid is in static equilibrium. If the fluid is water, we say it is in hydrostatic equilibrium. For a fluid in static equilibrium, the net force on any part of the fluid must be zero; otherwise, the fluid will start to flow. Pascal...
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Pressure of Fluids01:14

Pressure of Fluids

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There are many examples of pressure in fluids in everyday life, such as in relation to blood (high or low blood pressure) and in relation to weather (high- and low-pressure weather systems). A given force can have a significantly different effect, depending on the area over which the force is exerted. For instance, a force applied to an area of 1 mm2 has a pressure that is 100 times greater than the same force applied to an area of 1 cm2. That's why a sharp needle is able to poke through...
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Concept of Pressure at a Point01:15

Concept of Pressure at a Point

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The concept of pressure at a point in a fluid establishes that pressure within a fluid is uniform in all directions at a specific location. This uniformity occurs because fluid molecules exert force evenly across any point due to their random motion and continuous collisions within the fluid. Pressure at a point is determined by the surrounding fluid molecules and is influenced by factors like depth and density, rather than by shape or orientation.
In a fluid at rest, pressure acts equally in...
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Accelerating Fluids01:17

Accelerating Fluids

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When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
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Basic Equation for Pressure Field01:13

Basic Equation for Pressure Field

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The basic equation for a pressure field in fluid mechanics captures the balance of forces within any segment of fluid, providing a foundational understanding of how pressure changes within fluids under various forces. Generally, two main types of forces act on any part of a fluid: surface forces and body forces. Surface forces arise from pressure differences across points within the fluid, which result in net forces that can vary depending on the local pressure gradient. Body forces, on the...
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Biaxial Basal Tone and Passive Testing of the Murine Reproductive System Using a Pressure Myograph
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Modulus-pressure equation for confined fluids.

Gennady Y Gor1, Daniel W Siderius2, Vincent K Shen2

  • 1NRC Research Associate, Resident at Center for Materials Physics and Technology, Naval Research Laboratory, Washington, DC 20375, USA.

The Journal of Chemical Physics
|November 3, 2016
PubMed
Summary
This summary is machine-generated.

The elastic modulus of confined fluids is affected by pore size and temperature, but its pressure dependence slope remains consistent. This consistent slope can estimate unknown porous medium elastic moduli.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Condensed Matter Physics

Background:

  • Ultrasonic experiments measure elastic modulus in bulk and confined systems.
  • Previous work showed confined fluid elastic modulus depends on pore size.
  • Understanding confined fluid behavior is crucial for nanoporous materials.

Purpose of the Study:

  • Investigate the pressure dependence of elastic modulus (K(P)) for confined fluids.
  • Compare the slope of K(P) for bulk vs. confined fluids.
  • Propose a method to estimate porous medium elastic moduli.

Main Methods:

  • Transition-matrix Monte Carlo simulations.
  • Calculated elastic modulus of bulk argon and argon confined in silica mesopores.
  • Analyzed modulus-pressure dependence K(P).

Main Results:

  • Confinement and temperature significantly affect elastic modulus.
  • The slope of the modulus-pressure dependence (K(P)) is largely unaffected by confinement.
  • Calculated slopes agree with bulk argon data and experimental ultrasonic data for confined argon.

Conclusions:

  • The slope of K(P) is a robust indicator of elastic properties, independent of confinement.
  • This finding offers a new method for estimating the elastic moduli of porous materials.
  • The study validates simulation methods against experimental ultrasonic data.